3M Privacy Screen Filter for Apple ImacCustom cut privacy filter works in your 21. 5" Apple Mac Monitor to help protect your screen from everyday scratches and dust, and help keep the information displayed on them private. Advanced Microlouver technology delivers effective "black out" privacy from side views outside the 60 degree viewing angle. Wide screen filter reduces 35 percent of blue light transmission from the display and helps reduce reflections so you see your screen clearly with